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Table

Frequencies of malaria parasite species determined by microscopy and PCR in 2 samples of human blood from residents of Khanh Phu commune, Vietnam, 2009–2010*

Test categories

Active case detection†

Cross-sectional survey‡

Men

Women

Total

Men

Women

Total

No. tested

110

64

174

25

12

37

Patient mean age, y

25.7

25.1

25.5

20.7

20.0

20.4

By microscopy determination

Total no. parasite positive

47 (43)

22 (34)

69 (40)

25 (100)

12 (100)

37 (100)

No. Plasmodium falciparum positive

38 (35)

15 (23)

53 (30)

16 (64)

4 (33)

20 (54)

No. P. vivax positive

14 (13)

8 (13)

22 (13)

13 (52)

8 (67)

21 (57)

By PCR determination

Total no. parasite positive

60 (55)

28 (44)

88 (51)

25 (100)

12 (100)

37 (100)

No. P. falciparum positive

49 (45)

19 (30)

68 (39)

21 (84)

6 (50)

27 (73)

No. P. vivax positive

28 (25)

14 (22)

42 (24)

18 (72)

9 (75)

27 (73)

No. P. knowlesi positive

8 (7)

5 (8)

13 (7)

12 (48)

7 (58)

19 (51)

No. P. malariae positive

1

4

5

1

0

1

No. P. ovale positive

0

0

0

0

0

0

*Values are no. (%) except as indicated. All percentages are calculated over the total no. samples tested in each column. †The active case detection sample consisted of 174 blood samples of 549, including 69 of 121 found positive by microscopy. ‡In the cross-sectional survey, blood was taken from 624 persons, 49 of which were found positive by microscopy. A random selection of 37 blood samples of these 49 positive samples was analyzed by PCR.

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